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no head lights help???

ok i have surched and not found anything...i have a western unimount 7'6" poly pro on a 2001 chevy 2500hd i have a 9 pin harness with the +/- plug seperate. i replaced the truck side and plow side harnesses and all 6 relays last year and had no problems. i hooked up the plow to check everything and the blade works turnsignals work but no maker lights and no high or low beams i checked both the fuses and the grounds. i also tryied to swap relays to see if i had a bad one still nothing i pulled all relays off the truck and plugged them all back in acording to the scamatic and that got me know where.... any ideas where to go from there do i need to replace all my relays??? any help would be appriciated..

ok, I think your clue there is the no park lights. your relays get their power from the wire that's spliced into your truck park lights. so if that wire has disconnected, or if your fuse has blown and your truck park lights aren't working, then the relays can't switch over.

Check the connection where the relay harness connects to the vehicle park lights. They were a cheezy bullet connector and one of those blue pinch over things. They are unreliable and fail. Cut that out and do a butt connector and heat shrink.

update: checked all those conections and all is tight...i dont use those blue things either i use the heat shrink butt connecters... i used my light tester and have power to all the relays so ni think this should eliminate wires and i checked the ground to all the relays also fine all the way around... so where would this leave me? im not sure how to test the relays with a light tester can anyone help???

That's good to know you got this one working. Those relay systems can be so difficult to troubleshoot. So many setups, so many possible problems. The iso modules are soooo much easier to talk people through. Anyway "good on you" for fixing this one.

In order to dramatically simplify the park and signal lights on a plow, I prefer to just tee them straight in to the truck's lights. In some cases, this puts too much of a load on the truck's park and blinker circuits. The easy solution to this is to use LED lights in the plow.

Jasonv... the point of the relays is to NOT use any power from the original curcuit. The little magnetic coil on the relay draws very little power and switches battery power to forward to the plow lights. At least that's the way it is on the ones I have worked on.